| 冲绳海槽中南部浮岩的岩石地球化学特征及其成因 |
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| 引用本文： | 韩宗珠,李超,来志庆.冲绳海槽中南部浮岩的岩石地球化学特征及其成因[J].海洋湖沼通报,2008(3). |
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| 作者姓名： | 韩宗珠 李超 来志庆 |
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| 作者单位： | 中国海洋大学海洋地球科学学院,山东,青岛,266100 |
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| 摘 要： | 冲绳海槽中南部广泛分布一套浮岩类岩石,其中以灰白色酸性浮岩为主,化学组成相当于英安流纹岩,深灰色中基性浮岩零星出露,化学组成与玄武安山岩相当.研究表明本区浮岩属造山带地区火山岩,形成于强烈构造活动构造背景,稀土元素标准化模式相似,均表现为负铕异常,表明它们之间的同源性,并经历过不同程度不同的斜长石分异作用.除Sr和中部浮岩的Yb有明显亏损以外,其它微量元素均表现为明显富集,尤其是Ba、Rb、Th、La和Ce等大离子亲石元素表现为显著富集.
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| 关 键 词： | 冲绳海槽 浮岩 岩石地球化学 稀土元素 微量元素 |
GEOCHEMICAL FEATURES AND ORIGIN OF THE PUMICE FROM MIDDLE AND SOUTH OKINAWA TROUGH |
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| HAN Zongzhu,LI Chao,LAI Zhiqing.GEOCHEMICAL FEATURES AND ORIGIN OF THE PUMICE FROM MIDDLE AND SOUTH OKINAWA TROUGH[J].Transaction of Oceanology and Limnology,2008(3). |
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| Authors: | HAN Zongzhu LI Chao LAI Zhiqing |
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| Abstract: | A series of pumices were found in the middle and south Okinawa Trough.Most of them were mainly offwhite acidic pumices whose chemical compositions are similar with dacite and rhyolite.The rest is dark gray basic-intermediate rock,the composition of which is the same as basaltic andesite.The conclusion indicates that the pumices in the research area are orogenic belt volcanic rork and formed at the strong tectonic activity background.The REE pattern is quite similar,with an obvious negative Eu abnormality,which indicates all of them are homology but different in plagioclase differentiation process.Except the obvious Sr and Yb negative abnormality in middle area,all the other trace elements are perceptibly enriched,especially the large-ion lithophile elements,like Ba,Rb,Th,La and Ce. |
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| Keywords: | Okinawa Trough pumice geochemistry REE trace element |
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